electrical engineering MCQs – Page 17

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs

1. economics of power generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

321. The core used in high frequency transformer is usually___________?
0

A. cost iron core

B. copper core

C. mild steel core

D. air core

322. Two transformers operating in parallel will share the load depending upon their____________?
0

A. efficiencies

B. leakage reactance

C. per unit impedance

D. ratings

323. A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is_____________?
0

A. 4.6 A, 6.9 A

B. 4.6 A, 9.6 A

C. 6.4 A, 6.9 A

D. 6.4 A, 9.6 A

324. When one leg of parallel circuit is opened out the total current will______________?
0

A. increase

B. decrease

C. reduce

D. become zero

325. Insulating materials have the function of______________?
0

A. storing very high currents

B. preventing an open circuit between the voltage source and the load

C. conducting very large currents

D. preventing a short circuit between conducting wires

326. Resistance of a material always decreases if___________?
0

A. number of free electrons available become more

B. none of the above is correct

C. temperature of material is increased

D. temperature of material is decreased

327. The main reason for generation of harmonics in a transformer could be_______________?
0

A. fluctuating load

B. saturation of core

C. poor insulation

D. mechanical vibrations

328. A transformer cannot raise or lower the voltage of a D.C. supply because_______________?
0

A. there is no need to change the D.C. voltage

B. none of the above

C. Faradays laws of electromagnetic induction are not valid since the rate of change of flux is zero

D. a D.C. circuit has more losses

329. The resistance of a few meters of wire conductor in closed electrical circuit is____________?
0

A. very high

B. low

C. high

D. practically zero

330. Which winding in a transformer has more number of turns ?
0

A. Primary winding

B. Secondary winding

C. High voltage winding

D. Low voltage winding

331. An SCR can be used___________?
0

A. All of these

B. for power control

C. as static conductor

D. for speed control of dc shunt motor

332. In a transformer the tappings are generally provided on_____________?
0

A. secondary side

B. high voltage side

C. primary side

D. low voltage side

333. A carrier based PWM technique in CSI is composed of____________?
0

A. A switching and shorting pulse combination

B. A shorting pulse distributor

C. All of these

D. A switching pulse generator and a shorting pulse generator

334. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is___________?
0

A. 400 Q

B. 600 Q

C. 800 Q

D. 1000 Q

335. An ideal diode is___________?
0

A. Only (a) and (c)

B. Bidirectional

C. Fixed voltage polarity

D. Unidirectional

336. In a transformer the energy is conveyed from primary to secondary_________?
0

A. none of the above

B. through cooling coil

C. through air

D. by the flux

337. A transformer can have zero voltage regulation at______________?
0

A. zero power factor

B. unity power factor

C. leading power factor

D. lagging power factor

338. In a transformer the resistance between its primary and secondary is____________?
0

A. 1000 ohms

B. 1 ohm

C. infinite

D. zero

339. The permissible flux density in case of cold rolled grain oriented steel is around__________?
0

A. 3.7 Wb/m2

B. 4.7 Wb/m2

C. 2.7 Wb/m2

D. 1.7 Wb/m2

340. If/, R and t are the current, resistance and time respectively, then according to Joules law heat produced will be proportional to_______________?
0

A. I2Rt

B. I2R2t*

C. I2Rf

D. I2R2t

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